mahdiyazdani

This​ may be due to JavaScript errors or conflicts most likely caused by another 3rd party plugin​ or customization you have.
You need to diagnose JavaScript issues on your end and find out why the featured image is NOT showing in the single page view.

mahdiyazdani

This is because your website doesn't use the built-in jQuery that comes with WordPress and loads an external jQuery version instead.

All our themes and plugins are developed according to WordPress development recommendations to use internal jQuery and may not function properly with any external versions.

At this stage, I can confirm that this may be an issue with a 3rd party plugin you have or customization. Also, there might be a plugin conflict with a 3rd party plugin – you can check that by disabling then reactivating a plugin one at a time to see if you find a con​flict there.

Saji

Given the lack of activity, I'm going to close this issue for now. If you have any further questions, feel free to create a new one.